?using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Class1
    {
        private double r;
        private int m;
        private int n;
        public double R
        {
            get { return this.r; }
            set { this.r = value; }
        }
        public int L
        {
            get { return this.l; }
            set { this.l = value; }
        }
        public int W
        {
            get { return this.w; }
            set { this.w = value; }
        }
       
        public double A(double r)
        {
           return 3.14 * r * r;
        }

        public int B(int m,int n)
        {
            return  m * n;
        }
    }
}